When a place gets crowded enough to require IDs, social collapse is not far away. It is time to go elsewhere.

— Lazarus Long (as written by Robert A. Heinlein)

Cards are used for identification, payment, fun and collected. There are a wide variety of cards in use throughout Davis. Credit cards make payments (and often are debit cards for ATMs). UCD students use their Reg Card for just about everything. People looking to drive automobiles or motorcycles need to go to the DMV to get a license... in the form of a card.